Drilling-bit socket.



No. 802,401. PATENTED 001 .24, 1905.

J. s. LEME.

DRILLING BIT SOCKET.

APPLICATION FILED HAYS, 1905.

NEW 8 camm co.. nomumonnmiu wunmumn. x) c.

STATES PATENT OFFTCE.

DRILLING-BIT SOCKET.

Specification of Letters Patent.

Patented Oct. 24, ltit 5.

Application filed May 5,1905. Serial No. 259.063.

To whom it may concern:

Be it known that I, JAMES S. LIME, a citizen of the United States, residing at Pittsburg, in the county of Crawford and State of Kansas, have invented a new and useful Drilling- Bit Socket, of which the following is a specification.

The usual detachable connections employed between drill-bits and their stocks or drillbars includes a socket in one of the members and a pin carried by the other member detachably received withinthe socket. In some instances the pin and socket are threaded, in which event it is impossible to withdraw the bit by a reverse rotation of the drill-bar or stock, as the latter will merely unscrew out of the bit. In other instances the socket and pin are non circular, which precludes the withdrawing of the bit by reverse endwise movement of the stock or drill bar. Having appreciated these disadvantages, I propose to provide an improved detachable connection which will facilitate the assemblage and disconnection of the bit and its stock or drill-bar and at the same time will permit of the bit being withdrawn either by reverse rotation of the drill-bar or a reverse endwise movement thereof without employing any extraneous fastenings.

With this object in view the present invention consists in the combination and arrangement of parts, as will be hereinafter more fully described, shown in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that changes in the form, proportion, size, and minor details may be made within the scope of the claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a side elevation of a bit and its stock or drillbar assembled in accordance with the present invention, parts of the socket in the bit or drill being broken way. Fig. 2 is a detail view of the bit-engaging end of the stock or drill-bar. Fig. 3 is a rear end view of the bit or drill looking into the socket thereof. Figs. i and 5 are views similar to Figs. 2 and 3, showing a modification.

Like characters of reference designate cor responding parts in each and every figure of the drawings. 1

To illustrate the application of the present invention, there have been shown in the accompanying drawings a portion of a conventional form of drill or bit 1 and the forward portion of a drill-bar or stock 2, which may be threaded, as commonly used in connection with mine-drilling machines, or unthreaded, according to the character of the machine or power employed for driving the drill. In carrying out the invention one or the other of these members, preferably the drill or bit, is provided in its rear end with a socket 3, which is tapered inwardly and sinuous in formthat is to say, the middle portion of the socket is bowed laterally, as shown at 4:, so as to be offset from the longitudinal axis of the socket. The stock or drill-bar 2 is provided at its forward end with a longitudinallydisposed pin 5, which has the same sinuous shape as the socket 3, which produces a bulge 6 intermediate of the ends of the pin and at one side thereof and a corresponding recess 7 in its opposite side.

In connection with the assemblage of the drill and the stock or drill bar it will be noted that the entrance to the socket 3 is in clined slightly across the longitudinal axis of the drill and when fitting the two members together they are disposed at an angle to one another, so as to pass the forward end of the pin 5 into the socket, and then the members are gradually brought into longitudinal alinement, which works the forward end of the pin through the laterally-offset portion of the socket and finally brings the entire pin snugly into the socket. When thus assembled, the drill may be rotated by rotation of the stock or drill, bar 2, as the lateral bulge or ofiset portion 6 of the pin fitting in the correspondingly-oifset portion of the socket interlocks the members for simultaneous rotation, and therefore the drill may be driven forward by rotation of the stock and also drawn out of the hole by a reverse rotation of the stock. Furthermore, as the lateral offset 6 prevents endwise separation of the bit and the stock so long as these two members remain in alinement the drill or bit may be drawn directly out of the hole by a rearward end wise movement of the stock or drill-bar. At the same time the drill and stock may be conveniently disconnected by tilting the same and pulling endwise thereon, so as to work the pin out of the socket.

The embodiment of the present invention shown in Figs. 1, 2, and 3 discloses a square or polygonal socket and a correspondinglyshaped pin 5, while Figs. 4 and 5 disclose a substantially cylindrical socket and a substantially cylindrical pin. Otherwise the two forms are precisely alike.

From the foregoing description it will be noted that the present connection dispenses with extraneous fastenings, and therefore facilitates the assembling and disconnecting of the bit and its stock, while at the same time the connection is effective to transfer rotary movements and also endwise movements from the stock or drill-bar to the drill or hit, thus permitting of the efiectivedriving and withdrawing of the drill by manipulation of the drill-bar or stock.

Having thus described the invention, what is claimed is 1. A drill and stock having detachable ,interlocking members, one of whichconsists of a socket and the other of a pin fitting-snugly therein, correspondingopposite wall portions of said socket and pin being deflected from the longitudinal axesofthe members wi'th'the pin fitting snugly the socket to prevent endwise looseness and separation when the members are assembled and in longitudinal alinement.

2. A drill and stock having detachable .interlocking members, oneof which consists of a sinuous pin and the other of a sinuous socket of a-size and shape to snugly receive the pin and prevent endwise looseness and separation thereof when the members are assembled and in longitudinal alinement.

3. The combination of a drill and a stock therefor, one of said members having a tapered socket with its entrance inclined across the longitudinal axis of the socket and its intermediate portion offset laterally, the other member having a pin corresponding in shape to the socket and capable of being entered therein, the drill and the stock being interlocked against endwise separation when the socket and pin are assembled and the drill and stock in longitudinal alinement.

4:. The combination of a drill having a ta- ,pered socket in its rear end, the entrance to said socket being inclined across its longitudinal axis and its intermediate portion being bowed laterally, and a stock having a tapered pin shaped to fitwithin ,the socket, the lateral bowed portion-of the ;pin fitting in the lateral bowed portionof the socket to interlock the drill and stock for simultaneous rotation and to prevent end wise separation of the members when .in longitudinal alinement.

In testimony that I claim the foregoing as my own 1 :have heretoaffixed my signature in :the presence of witnesses.

' JAMES S. LIME.

WVitnesses:

ANDREW BROWN, E. W. ALBERTY, E'nHEL MoRRILL. 

